GE L30 User Manual

5-206 L30 Line Current Differential System GE Multilin
5.6 GROUPED ELEMENTS 5 SETTINGS
5
• DD LOGIC SEAL-IN: This setting is used to maintain disturbance detector output for such conditions as balanced
three-phase fault, low level time overcurrent fault, etc. whenever the disturbance detector might reset. Output of the
disturbance detector will be maintained until the chosen FlexLogic operand resets.
The user may disable the DD EVENTS setting as the disturbance detector element will respond to any current distur-
bance on the system which may result in filling the events buffer and possible loss of valuable data.
Figure 5–88: DISTURBANCE DETECTOR SCHEME LOGIC
NOTE
827044A7.CDR
SETTING
SETTING
SETTING
Off=0
Off=0
Off=0
DD NON-CURRENT
SUPV:
DD CONTROL
LOGIC:
DD LOGIC
SEAL-IN:
DD FUNCTION:
COMPUTE SEQ.
CURRENTS
DELTA LEVEL
DETECTOR
ADAPTIVE LEVEL
DETECTOR
RUN
RUN
LOGIC
LOGIC
SETTING
ACTUAL
FLEXLOGIC OPERAND
Enabled=1
I_1
50DD SV
I_2
I_0
ABS (I_1-I_1')>0.04 pu
(I_1' is 4 cycles old)
I_0 > 0.12 to 0.24 pu
I_2 > 0.12 to 0.24 pu
ABS (I_2-I_2')>0.04 pu
(I_2' is 4 cycles old)
ABS (I_0-I_0')>0.04 pu
(I_0' is 4 cycles old)
NOTE:
ADJUSTMENTS ARE
MADE ONCE EVERY
8 CYCLES TO THE
NEXT LEVEL (HIGHER
OR LOWER) IN 0.02 pu
STEPS USING THE
HIGHEST VALUE OF
I_0 AND I_2.
AND
AND
OR
OR
OR
OR
AND

GE L30 Specifications

General

Brand	GE
Model	L30
Category	Relays
Language	English